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[Event "EMBA 2011-04-08"]
[Site ""]
[Date ""]
[Board "29"]
[West "Dick Lee"]
[North "Bob Gorsey"]
[East "Pete"]
[South "Sue Ostrowski"]
[Dealer "N"]
[Vulnerable "None"]
[Deal "N:Q9.QT72.T75.J653 K7.A864.KJ2.A842 JT642.J5.AQ96.T9 A853.K93.843.KQ7"]
[Scoring ""]
[Declarer "E"]
[Contract "3NT"]
[Result ""]
{After planning the play I ducked the opening lead of the \S7 smoothly in hand.
 (At the time, I felt I would need a diamond trick - my mistake.)  After some
thought, Bob returned the \S9.  I ducked the \H9 into Bob's hand - not knowing
the \H10 and \HQ were equivalent, he won the \H10. 

Bob's return of a diamond went to the \DJ and \DQ.  Sue thought a long time
before returning to the \SJ, from which I deduced she held the \DA; I won the
\SA and dumped a diamond.  Cashing the \CK and \CQ, I noted the fall of the
\C10 and \C9.  When Bob followed to a third club, I was in a <i>restricted choice</i>
situation:  when an opponent plays one or more equivalent cards, the odds
favor that she has no or restricted choice in the play.  In other words, that
the other opponent has the missing such card.  I went with the odds, and
finessed.

The fourth club followed, pitching a spade from dummy. Now the \HA, got the
\HJ on my left. Since Bob's earlier play was not a choice, when Bob followed
low to the third heart, restricted choice applied once again to Sue's hand. 
The heart finesse brought home nine tricks, losing a heart, a spade, a
diamond, and the \DA at the end.

These are not the garden-variety restricted choice play, nine cards missing
KQxx, but seven cards missing three equivalent cards.  Each time, a finesse of
the 8 was technically correct, and won.  The odds were improved by the known
5-card suit and likely diamond length in the South hand.  

For a better explanation of restricted choice and more references, please see
my article, <i>Bridge</i> <i>Scoring, Strategy and Tactics,</i> at
http://web.mit.edu/mitdlbc/www/contrib.html#Articles.

- Pete Matthews}
[Auction "N"]
Pass {No suitable call -- 11- HCP; 12- total points}
1NT {notrump opener -- 2-5 C; 2-5 D; 2-4 H; 2-4 S; 15-17 HCP}
Pass {No suitable call -- 20- total points}
2C {Stayman --}
Pass {No suitable call -- 11- HCP; 12- total points}
2H {2-5 C; 2-5 D; 4 H; 2-4 S; 15-17 HCP}
Pass {No suitable call -- 20- total points}
3NT {3- H; 4 S; 10+ HCP}
AP
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N  S  5
N  H  3
N  D  5
N  C  3
N NT  3
E  S  8
E  H  9
E  D  8
E  C  9
E NT  9
S  S  5
S  H  4
S  D  5
S  C  3
S NT  3
W  S  8
W  H  9
W  D  8
W  C  9
W NT  9